<html lang="en">
  <head>
    <link href="calculator.css" rel="stylesheet" type="text/css">
  </head>
  <body>
    <div id="calculator">
      <div id="c_title">
        <h2 id="c_title">
          Test Observe
          <br>
          <span id="msg">
            init buttons string
          </span>
        </h2>
        <p>
          this is after observe
        </p>
      </div>
    </div>
  </body>
</html>
